dangernoodle-io / TaipanMiner / 27726709796 / 2

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feat(telemetry): publish mining source (hashrate/shares/rejected) on the mining topic (#538)

- add tm_mining_sample() sampler: snapshots hw_ema/asic_ema + session.shares/rejected
  under mining_stats.mutex, then emits hashrate_hs/shares/rejected via bb_json_obj_set_number
- register source after bb_registry_init(): bb_pub_register_source("mining", tm_mining_sample, NULL)
- raise CONFIG_BB_PUB_MAX_SOURCES to 10 in sdkconfig.defaults (7 bb auto-sources + mining = 8; headroom to 10)
- host test not added: tm_mining_sample lives in esp-only main.c (not in build_src_filter) and depends on freertos xsemaphoretake + mining_stats esp-platform struct; refactor cost exceeds value — hw validation covers it

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